It is a common rule in EU however that you can not favor one company over another. This is what is the issue here, not the specific tax rate. The EU isn't sayin

It is a common rule in EU however that you can not favor one company over another. This is what is the issue here, not the specific tax rate. The EU isn't saying what tax rate Ireland may tax at simply that they have to treat every company the same. How do you think the single market would work if say Irish owned companies paid half the tax of spanish owned companies in Ireland?